Getting the following error: error C2059: syntax error : '=', can anyone help?

I am trying to define values for the variables "area" and "circ" but everytime I try to build the project I get this error:

Code:

`error C2059: syntax error : '='`

Here is the code in question:

Code:

`#include<stdio.h>`

#include<math.h>

#define PI = 3.14159

int main()

{

int var1, two = 2;

double radius, area, circ;

printf("Program: Arithmetic Expressions\nAuthor: Stephen Haroldson\nEnter unsigned short int: ");

scanf("%d", &var1);

printf("The value of %d raised to the %d power is %f\n", two, var1, pow(two, var1));

printf("Enter unsigned short int: ");

scanf("%1f", &radius);

area = PI * radius * radius;

circ = 2 * PI * radius;

printf("A circle with a radius %d has a circumference of %f and an area of %f\n", radius, circ, area);

return 0;

}

If anyone can give me any suggestions I would appreciate it greatly. Thanks.